So I always wondered how this worked, the "removed" thing when describing the familial distance of cousins you barely know from out of town. Well, here's a helpful chart to pull out at the next Thanksgiving or reunion to suss it all out. Even more helpful would be a line designating for which cousins it's not taboo to pursue sex, though I guess that's dependent on regional preferences, laws, and general attractiveness. ;-)
Click on the chart for a bigger look-see.